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Institut für Astronomie und Astrophysik

Abteilung Astronomie

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Preprint G/05

Spectral analyses of DO white dwarfs and PG1159 stars from the Sloan Digital Sky Survey

S. D. Hügelmeyer (1), S. Dreizler (1), K. Werner (2), J. Krzesinski (3, 4), A. Nitta (3), S. J. Kleinman (3)

(1) Institut für Astrophysik, Göttingen, Germany
(2) Institut für Astronomie und Astrophysik, Tübingen, Germany
(3) Apache Point Observatory, New Mexico State University, USA
(4) Mt. Suhora Observatory, Cracow, Poland

To be published in: A&A

Abstract. We present a model atmosphere analysis of ten new DO white dwarfs and five new PG1159 stars discovered in the Sloan Digital Sky Survey DR1, DR2 and DR3. This is a significant increase in the number of known DOs and PG1159 stars. DO white dwarfs are situated on the white dwarf cooling sequence from the upper hot end Teff ~ 120 000 K down to the DB gap (Teff ~ 45 000 K). PG1159 stars on the other hand feature effective temperatures which exceed Teff = 65 000 K with an upper limit of Teff = 200 000 K and are the proposed precursors of DO white dwarfs. Improved statistics are necessary to investigate the evolutionary link between these two types of stars. From optical SDSS spectra effective temperatures, surface gravities and element abundances are determined by means of non-LTE model atmospheres.


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